Add taproot psbt fields (Sourcery refactored)

[sourcery-ai[bot]]

Pull Request #107 refactored by Sourcery.

Since the original Pull Request was opened as a fork in a contributor's repository, we are unable to create a Pull Request branching from it.

To incorporate these changes, you can either:

1. Merge this Pull Request instead of the original, or

2. Ask your contributor to locally incorporate these commits and push them to the original Pull Request

   Incorporate changes via command line

   git fetch https://github.com/btclib-org/btclib pull/107/head
   git merge --ff-only FETCH_HEAD
   git push

NOTE: As code is pushed to the original Pull Request, Sourcery will re-run and update (force-push) this Pull Request with new refactorings as necessary. If Sourcery finds no refactorings at any point, this Pull Request will be closed automatically.

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[sourcery-ai[bot]]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 1.92%.

Quality metrics	Before	After	Change
Complexity	3.17 ⭐	4.15 ⭐	0.98 👎
Method Length	85.84 🙂	83.11 🙂	-2.73 👍
Working memory	8.38 🙂	9.90 😞	1.52 👎
Quality	68.82% 🙂	66.90% 🙂	-1.92% 👎

Other metrics	Before	After	Change
Lines	1419	1758	339

Changed files	Quality Before	Quality After	Quality Change
btclib/psbt/psbt_in.py	56.77% 🙂	48.59% 😞	-8.18% 👎
btclib/psbt/psbt_out.py	75.68% ⭐	64.78% 🙂	-10.90% 👎
btclib/psbt/psbt_utils.py	81.82% ⭐	84.17% ⭐	2.35% 👍
btclib/script/taproot.py	64.83% 🙂	65.78% 🙂	0.95% 👍
tests/psbt/test_psbt.py	71.98% 🙂	71.55% 🙂	-0.43% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
btclib/psbt/psbt_in.py	PsbtIn.parse	22 😞	394 ⛔	45 ⛔	15.54% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
btclib/psbt/psbt_in.py	PsbtIn.serialize	28 😞	367 ⛔	7 🙂	35.32% 😞	Refactor to reduce nesting. Try splitting into smaller methods
btclib/psbt/psbt_in.py	PsbtIn.__init__	1 ⭐	217 ⛔	26 ⛔	41.44% 😞	Try splitting into smaller methods. Extract out complex expressions
btclib/psbt/psbt_out.py	PsbtOut.parse	9 🙂	150 😞	19 ⛔	42.52% 😞	Try splitting into smaller methods. Extract out complex expressions
btclib/script/taproot.py	check_output_pubkey	8 ⭐	212 ⛔	11 😞	47.79% 😞	Try splitting into smaller methods. Extract out complex expressions

Legend and Explanation

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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